Will MV cause locking for FAST REFRESH

Hi ,
I want to create an MV on a table on a FAST REFRESH basis but this table is being constantly being updated/inserted and i am unsure of exactly the no of transactions but possibly in hundreds.
1)
with that in mind , would a FAST REFRESH on a schedule of every 10th mins be a good option and during the FAST REFRESH will it actually cause the master table to be locked and prevent updates/inserts from being done ?
2)
and during the time where my source database is down from re-org , there could be possibly changes in thousands e.g from 5000 - 10,000 , will a FAST REFRESH in this case bog down the source database then ?
pls advise
, in this case

A fast refresh won't prevent you from doing DML on the source table. A fast refresh will generate additional load on the primary server, though, and there will also be additional load for every transaction on the source system that has to write a change vector into the materialized view log.
If you're really concerned about the load on the source system, using Streams for your replication is designed to put much less load on the primary system.
Justin

Similar Messages

Materialized view logs for Fast refreshes

Hi,
I created MV and MV logs on the base table/main table. I set the base table in NOLOGGING MODE. so ofcourse redo is not gonna generate during DML but i wanted to know that:
Will NOLOGGING effect the MV logs for fast refreshes?
I came up on conclusion that MV logs are nothing to do with Redo Logs and would have no impact on MV logs for fast refresh since i have set my all base table in NOLOGGING MODE.
Looking forward for expert opinion.
REGARDS,

Though I'm not an expert...
SQL> alter table emp nologging;
Table altered.
SQL> create materialized view log on emp;
Materialized view log created.
SQL> select * from tab;
TNAME TABTYPE CLUSTERID
EMP TABLE
BONUS TABLE
SALGRADE TABLE
RUPD$_EMP TABLE
MLOG$_EMP TABLE
SQL> insert into emp values(1000,'Matt','Test',100,sysdate,1000,1000,10,11,11);
1 row created.
SQL> select *From mlog$_emp;
EMPNO SNAPTIME$ D O
CHANGE_VECTOR$$
1000 01-JAN-00 I N
FEFF

Materialized View with Join for FAST Refresh

Hi Gurus,
Facing issues in MV with a simple join for FAST Refresh.
2 sample Tables:
1. employee
empid integer PK
empname varchar(50)
deptid integer FK
2. delta_employee
empid integer PK
empname varchar(50)
deptid integer FK
dmlflag varchar(2)
watermark integer
Code is as given below -
CREATE MATERIALIZED VIEW LOG ON work.employee
WITH SEQUENCE,rowid(empid)
INCLUDING NEW VALUES;
CREATE MATERIALIZED VIEW LOG ON work.delta_employee
WITH SEQUENCE,rowid(empid)
INCLUDING NEW VALUES;
CREATE MATERIALIZED VIEW work.MVEmployee REFRESH force on
demand with rowid AS
select e.empid,e.empname,e.deptid,d.empid t1
from work.employee e, work.delta_employee d
where e.empid = d.empid;
Able to perform Complete Refresh. Not able to use Fast Refresh for
incremental refresh.
Please help.
Thanks,
J Kumar

Found a solution,
As per oracle documentation rowid fileds should be included in the Select statement. Even though I included the rowid fields, empid in this case it still didnt work.
The implementation of the rowid column should be included with tablename.rowid instead of the tablename.columnname !
Modified script is as given below.
CREATE MATERIALIZED VIEW WORK.MVEMPLOYEE
REFRESH FORCE ON DEMAND
WITH PRIMARY KEY
AS
select e.rowid "empid",d.rowid "t1" ,e.empname,e.deptid
from work.employee e, work.delta_employee d
where e.empid = d.empid;
And It really WORKS

Enabling materialized view for fast refresh method

In AWM when i select refresh method as FAST and enable the materialized view, am getting the below error:
"Refresh method fast requires materialized view logs and a previously run complete refresh of the cube mv". i need this Fast refresh of a cube materialized view, so that it performs an incremental refresh and re-aggregation of only changed rows in the source table.
can anyone help me on this??

If you want the cube to hold data even after it has been deleted from the relational table, then you should disable the MV on the cube.
Synchronization with the source table is determined by the default "cube script".
<li>CLEAR, LOAD, SOLVE : This will synchronize your cube with the source table. It is a requirement for MVs.
<li>LOAD, SOLVE: This will allow your cube to contain data even after it has been removed from the source table. It sounds like you want this.
Cube builds can be "incremental" in one of two ways.
(1) You can have an "incremental LOAD" if the source table contains only the changed rows or if you use MV "FAST" or "PCT" refresh. Since you can't use MVs, you would need a source table with only the changed rows.
(2) You will have an "incremental SOLVE" (a.k.a. "incremental aggregation") if there is no "CLEAR VALUES" or "CLEAR AGGREGATES" step and various other conditions hold.
To force a "complete LOAD" with an "incremental SOLVE" you should have all rows in your source table and run the following build script.
LOAD, SOLVE You could also run "CLEAR LEAVES, LOAD, SOLVE" to synchronize the cube with the table.
To force an "incremental LOAD" with a "complete SOLVE" you make the source table contains only the changed rows and the run the following:
CLEAR AGGREGATES, LOAD, SOLVEor
LOAD, CLEAR AGGREGATES, SOLVEFinally, if you want both LOAD and SOLVE to be incremental you make the source table contains only the changed rows and the run the following:
LOAD, SOLVE

Creation of materialized view with view log file for fast refresh in 10.1db

Hi,.. I have a select statements that includes data from almost 20 tables and takes long time to complete..I am planing to create a materialized view on this.. would you please suggest best way of doing this?
we would like to have materialized view and materialized log file to refresh changes from underline table to mv view. please provide help on this .. thanks in advance

It will be possible to create a Materialised view with up to 20 tables, but you have to understand the restrictions on complex Materialised views with regards to fast refresh.
To help your understanding, refer to Materialized View Concepts and Architecture
<br>
Oracle Database FAQs
</br>

Regarding Error in Materialized view Fast Refresh

ORA-12015: cannot create a fast refresh materialized view from a complex query
CREATE MATERIALIZED VIEW MVCONTENTHISTORY_01
BUILD IMMEDIATE
REFRESH FAST
WITH PRIMARY KEY
ENABLE QUERY REWRITE
AS
SELECT a.DAY, a.contentname,
SUM
(CASE
WHEN (b.subscriptionstartdate) <= (a.DAY)
AND ((CASE
WHEN b.subscriptionenddate IS NOT NULL
THEN (a.DAY)
ELSE TO_DATE ('01/20/1990', 'MM/DD/YYYY')
END
) <=
(CASE
WHEN b.subscriptionenddate IS NOT NULL
THEN (b.subscriptionenddate)
ELSE TO_DATE ('01/20/1990', 'MM/DD/YYYY')
END
THEN 1
ELSE 0
END
) COUNT,
COUNT
(CASE
WHEN (b.subscriptionstartdate) <= (a.DAY)
AND ((CASE
WHEN b.subscriptionenddate IS NOT NULL
THEN (a.DAY)
ELSE TO_DATE ('01/20/1990', 'MM/DD/YYYY')
END
) <=
(CASE
WHEN b.subscriptionenddate IS NOT NULL
THEN (b.subscriptionenddate)
ELSE TO_DATE ('01/20/1990', 'MM/DD/YYYY')
END
THEN 1
ELSE 0
END
) cnt
FROM TBLTDATEWISECONTENT a,
(SELECT TRUNC (a.subscriptionstartdate) subscriptionstartdate,
TRUNC (a.subscriptionenddate) subscriptionenddate, b.NAME,
b.contentid
FROM syntbltcontentsubscrhistory a, syntblmcontent b
WHERE b.contentid = a.contentid(+)) b
WHERE a.contentid = b.contentid(+) AND a.DAY = b.subscriptionstartdate(+)
GROUP BY a.contentname, a.DAY;
I can't create Materialized view with fast Refresh .
Kindly provide solution .
Regards,
nayana chavda.

Kindly provide full Oracle version since option vary by release.
There error message says it is impossible to fast refresh based on a complex query.
On 10g Oracle provides a package procedure that will tell you why the view cannot be fast refreshed: dbms_mview.explain_mview.
Otherwise see the Advanced Replication Manual for a list of restrictions.
10gR2 >>Restrictions for Materialized Views with Subqueries
The defining query of a materialized view with a subquery is subject to several restrictions to preserve the materialized view's fast refresh capability.
The following are restrictions for fast refresh materialized views with subqueries:
Materialized views must be primary key materialized views.
The master's materialized view log must include certain columns referenced in the subquery. For information about which columns must be included, see "Logging Columns in the Materialized View Log".
If the subquery is many to many or one to many, join columns that are not part of a primary key must be included in the materialized view log of the master. This restriction does not apply to many to one subqueries.
The subquery must be a positive subquery. For example, you can use the EXISTS condition, but not the NOT EXISTS condition.
The subquery must use EXISTS to connect each nested level (IN is not allowed).
Each table can be in only one EXISTS expression.
The join expression must use exact match or equality comparisons (that is, equi-joins).
Each table can be joined only once within the subquery.
A primary key must exist for each table at each nested level.
Each nested level can only reference the table in the level above it.
Subqueries can include AND conditions, but each OR condition can only reference columns contained within one row. Multiple OR conditions within a subquery can be connected with an AND condition.
All tables referenced in a subquery must reside in the same master site or master materialized view site.
<<
HTH -- Mark D Powell --
Message was edited by: added list of restrictions left off initial post
mpowel01

ORA-12015: cannot create a fast refresh materialized view from a complex qu

BANNER
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
PL/SQL Release 11.2.0.1.0 - Production
CORE    11.2.0.1.0      Production
TNS for Linux: Version 11.2.0.1.0 - Production
NLSRTL Version 11.2.0.1.0 - ProductionI'm trying to create a fast refresh materialized view that uses a column of xmltype. The problem is I cannot create an MV log that accounts for the xmltype column. I tried excluding it and got the above error. Is there another way I can incrementally update a materialized view where I don't have to do a COMPLETE refresh or use FAST refresh?
CREATE TABLE "DAS_DESC"."AUTHORITY_TEST"
    "NAID"      NUMBER(20,0) NOT NULL ENABLE,
    "AUTH_TYPE" VARCHAR2(40 BYTE),
    "XML_DATA" "SYS"."XMLTYPE" ,
    "TERM_NAME" VARCHAR2(4000 BYTE)
CREATE TABLE "DAS_DESC"."AUTH_ASSC_TEST"
    "NAID"    NUMBER(20,0),
    "P_NAID" NUMBER(20,0),
    "REL_TYPE"    VARCHAR2(25 BYTE),
    "XML_DATA" "SYS"."XMLTYPE"
CREATE
MATERIALIZED VIEW person_mv
AS
SELECT p.naid
      , p.auth_type
      , INSERTCHILDXML
          p.xml_data                 -- Parent XML Column
        , '//*[contains(local-name(), ''person'')]' --XPATH to Person
        , 'nonPreferredHeadingArray'                -- Value for new child element
        (                                                       -- Sub query for injecting new variant person array
          SELECT XMLELEMENT
            "nonPreferredHeadingArray"
          , XMLAGG -- Aggregator for Variant Persons Array
              XMLELEMENT
                "variantPersonName"                    -- Wrapper for each entry in array
              , extract(a.xml_data,'*/*')
          FROM auth_assc_table -- Link table
          WHERE a.p_naid = p.naid
      ) AS XML_DATA
FROM authority p -- Parent table
WHERE p.auth_type = 'Person';The views are created fine and they work perfectly for what we need. The problem is the refresh when we edit the base tables. Ideally, it should take a couple seconds. Right now, it takes a couple minutes. XMLTYPE is one problem and the Complex Query exception is the other. If there is a work-around for fast refresh, please let me know. Greatly appreciated.

jjmdb wrote:
I'm trying to create a fast refresh materialized view that uses a column of xmltype. The problem is I cannot create an MV log that accounts for the xmltype column. I tried excluding it and got the above error. Is there another way I can incrementally update a materialized view where I don't have to do a COMPLETE refresh or use FAST refresh? Besides XMLTYPE column, your MV definition has a subquery which prevents it from being fast refreshable.
I could not find any specific reference in documentation about restriction on XMLTYPE (or CLOB) columns but it seems logical that oracle will not be able to keep track of changes to binary data. What does DBMS_MVIEW.EXPLAIN_MVIEW generate for your MV definition? That should tell you which all conditions (for FAST REFRESH) your MV violates. Since you can not create a MV LOG to include XMLTYPE column, it will not be possible to create a FAST REFRESHABLE MV that includes the XMLTYPE column.
I am afraid there is not much you can do here unless you are prepared to change the way data is stored in your base tables. If you can store data in base tables using standard data types instead of binary/XML storage, you might be able to create a FAST REFRESHABLE MV.

Fast refresh of materialized view

Hi All,
This is my first posting on this forum, so I hope I don't step on anyone's toes as I wade into a problem that I am experiencing.
I have a number of either join-only or single table aggregate materialized views that I have experienced problems with. All the views are setup for FAST REFRESH ON DEMAND but I'm hitting an error if I execute a COMPLETE refresh of the view when I've done an ALTER SESSION ENABLE PARALLEL DML. The error I get is:
ERROR at line 1:
ORA-30439: refresh of 'DTKTGT.CTNS_PER_HR_VOL_AGG_MV' failed because of ORA-32320: REFRESH FAST of "DTKTGT"."CTNS_PER_HR_VOL_AGG_MV" unsupported after cointainer table PMOPs
ORA-06512: at "SYS.DBMS_SNAPSHOT", line 814
ORA-06512: at "SYS.DBMS_SNAPSHOT", line 872
ORA-06512: at "SYS.DBMS_SNAPSHOT", line 852
ORA-06512: at "DTKTGT.MV_REFRESH", line 21
ORA-06512: at line 2
Any help anyone could provide would be greatly appreciated as every now and then, a COMPLETE refresh is unavoidable and using the ENABLE PARALLEL DML makes the refresh run a lot faster than without the ALTER SESSION.
Gary

This forum only is for questions relating to the use of OLAP Option. I would post your question on the database forum.
Keith Laker
Oracle Data Warehouse Product Management
OLAP Blog: http://oracleOLAP.blogspot.com/
OLAP Wiki: http://wiki.oracle.com/page/Oracle+OLAP+Option
DM Blog: http://oracledmt.blogspot.com/
OWB Blog : http://blogs.oracle.com/warehousebuilder/
OWB Wiki : http://wiki.oracle.com/page/Oracle+Warehouse+Builder
DW on OTN : http://www.oracle.com/technology/products/bi/db/11g/index.html

Error While Creating Fast Refresh Materialized view.

Table Scripts:
CREATE TABLE CONTRACT_MASTER
CONTRACT_SEQ                    NUMBER(10)    NOT NULL,
PDN                             CHAR(5)       NOT NULL,
APPID                           NUMBER(10)    NOT NULL,
CONTRACT_LOB_DESC               VARCHAR2(20) NOT NULL,
CUSTOMER_NAME                   VARCHAR2(57) NOT NULL,
CONTRACT_DT                     DATE          NOT NULL,
CONTRACT_RECD_DT                DATE          NOT NULL,
HELD_OFFERING_DT                DATE          NOT NULL,
DRAFT_AMT                       NUMBER(15,2) NOT NULL,
STATUS_DESC                                   VARCHAR2(20) NOT NULL,
GIF_UPLOAD_TM                                            TIMESTAMP     NOT NULL
CREATE table CONTRACT_COMMENTS
CONTRACT_COMMENTS_SEQ           NUMBER(10)     NOT NULL,
APPID                           NUMBER(10)     NOT NULL,
COMMENTS                        VARCHAR2(1000) NOT NULL,
GIF_UPLOAD_TM                                            TIMESTAMP      NOT NULL
Constraints on tables
ALTER TABLE CONTRACT_MASTER ADD
CONSTRAINT XPKCONTRACT_MASTER PRIMARY KEY (CONTRACT_SEQ) USING INDEX ;
ALTER TABLE CONTRACT_COMMENTS ADD
CONSTRAINT XPKCONTRACT_COMMENTS PRIMARY KEY (CONTRACT_COMMENTS_SEQ) USING INDEX ;
alter table CONTRACT_MASTER add CONSTRAINT XUIAPPCONTRACT_MASTER UNIQUE (APPID) USING INDEX;
CREATE INDEX XUIAPPCONTRACT_COMMENTS ON
CONTRACT_COMMENTS(APPID) ;
Materialized View Creation:
CREATE MATERIALIZED VIEW LOG ON CONTRACT_MASTER WITH PRIMARY KEY,ROWID;
CREATE MATERIALIZED VIEW LOG ON CONTRACT_COMMENTS WITH PRIMARY KEY, ROWID;
CREATE MATERIALIZED VIEW MV_CONTRACT_COMMENTS_HELDOFFERING
REFRESH FAST
ENABLE QUERY REWRITE AS
SELECT APPID,COMMENTS FROM CONTRACT_COMMENTS WHERE APPID IN (
SELECT APPID FROM CONTRACT_MASTER WHERE STATUS_DESC = 'Held Offering' )
Errors generated:
ERROR at line 4:
ORA-12015: cannot create a fast refresh materialized view from a complex query
_*Afer That I have changed the query but still it was not created like:*_
CREATE MATERIALIZED VIEW MV_CONT_COMMNTS_HELDOFFERNG
REFRESH FAST
ENABLE QUERY REWRITE AS
SELECT CONTRACT_COMMENTS_SEQ,c.APPID,COMMENTS
FROM CONTRACT_COMMENTS c,CONTRACT_MASTER m
WHERE m.APPID = c.APPID and m.STATUS_DESC = 'Held Offering'
*even though error displayed:
SQL> CREATE MATERIALIZED VIEW MV_CONT_COMMNTS_HELDOFFERNG*
   2 REFRESH FAST
   3 ENABLE QUERY REWRITE AS
   4 SELECT CONTRACT_COMMENTS_SEQ,c.APPID,COMMENTS
   5 FROM CONTRACT_COMMENTS c,CONTRACT_MASTER m
   6 WHERE m.APPID = c.APPID and m.STATUS_DESC = 'Held Offering';
FROM CONTRACT_COMMENTS c,CONTRACT_MASTER m
ERROR at line 5:
ORA-12052: cannot fast refresh materialized view GSSIO.MV_CONT_COMMNTS_HELDOFFERNG
*Again I have done "Analyzing Materialized Views for Fast Refresh" as follows:*
1: exec dbms_mview.explain_mview('MV_CONT_COMMNTS_HELDOFFERNG');
2: SELECT capability_name, possible, SUBSTR(msgtxt,1,60) AS msgtxt
           FROM mv_capabilities_table
           WHERE capability_name like '%FAST%';
Output is :
CAPABILITY_NAME                               P              MSGTXT
REFRESH_FAST                                   N
REFRESH_FAST_AFTER_INSERT            N the SELECT list does not have the rowids of all the detail t
REFRESH_FAST_AFTER_ONETAB_DML   N see the reason why REFRESH_FAST_AFTER_INSERT is disabled
REFRESH_FAST_AFTER_ANY_DML         N see the reason why REFRESH_FAST_AFTER_ONETAB_DML is disabled
REFRESH_FAST_PCT                            N PCT is not possible on any of the detail tables in the mater
Please suggest what to do to implement fast refresh materialized view for same.Edited by: dba on Sep 20, 2010 12:00 AM

If the two MVs have to be consistent with each other as of a specific time, put them into a Refresh Group and refresh them with DBMS_MVIEW.REFRESH
If an MV is dependent on another, use DBMS_MVIEW.REFRESH_DEPENDENT
See the "Oracle® Database PL/SQL Packages and Types Reference" documentation pages for DBMS_MVIEW.
Hemant K Chitale
http://hemantoracledba.blogspot.com --- this is NOT a documentation site.
Edited by: Hemant K Chitale on Sep 20, 2010 5:19 PM

Materiazed view with fast refresh

Hi All,
I want to create a Materialized view with fast refresh.
I think for fast refresh we need to set up a materialized view log first before the MV gets created.
Can someone please provide the steps and the syntax to do this?
I am new to MV creation so appreciate any help in this regard.
Thanks.
AS

http://www.morganslibrary.org/library.html
Look up Materialized View Log and Materialized View ... both on the same page ... build the demo MV and you can modify the code to build any others you wish.

Script to access users causing locks in Apps db

Hi,
Presently we have a script to find out SID causing lock for long time.
How can we find out which forms user, or thin client user, or concurrent request is causing it?
With Thanks,
Ram

Thanks,
Is there any script for finding out who is exactly causing lock?
It can be a database user or fnd login or any thin client.
Ramneek

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FAST refresh not working for Cube & Dimensions in AWM

Hi,
My doubt is regarding refreshing cube/dimension using FAST refresh method in AWM
1     My dimension (MVIEW refresh enabled in AWM) is refreshed without an error when I pass the refresh method parameter as *'F'* in DBMS_CUBE.BUILD() script, although there is no MVIEW log present on the dim table.
     In ALL_MVIEWS.LAST_REFRESH_TYPE, a *'COMPLETE'* refresh is logged.
2. My CUBE doesn't allow to select refresh_type=FAST when there is no MVIEW log built.
     The same CUBE (MVIEW refresh enabled, refresh_type=FAST in AWM) throws following error even when I create Mview logs for all fact and dimension tables in the DB.
java.lang.NullPointerException
at oracle.olap.awm.dataobject.DatabaseDO.commitOLAPI(Unknown Source)
at oracle.olap.awm.dataobject.aw.WorkspaceDO.commitOLAPI(Unknown Source)
at oracle.olap.awm.dataobject.olapi.UModelDO.commitOLAPI(Unknown Source)
at oracle.olap.awm.dataobject.olapi.UModelDO.update(Unknown Source)
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at oracle.olap.awm.dataobject.dialog.PropertyViewer.doApplyAction(Unknown Source)
at oracle.olap.awm.dataobject.dialog.PropertyViewer$1ApplyThread.run(Unknown Source)
If I continue with this error, CUBE mview vanishes from the DB.
Please help - How to do a FAST refresh for CUBE and Dimensions.
Edited by: 861346 on May 26, 2011 12:12 AM
Edited by: 861346 on May 26, 2011 12:13 AM
Edited by: 861346 on May 26, 2011 12:14 AM

If your object is to process the cube as quickly as possible, MV refresh of the cube is probably not required. As an alternative, you can do the following:
- Map the cube to a view and use a filter control what data is presented to the cube during a refresh.
- Avoid dimension maintenance (adding new members, dropping members, changing parent-child relationships).
Let's say you update your cube daily with sales data coming from 10,000 stores. You could add a LAST_UPDATED column to the source fact table, timestamp rows whenever the fact table is updated and then filter on that column in a view to present only the new or changed records to the cube (or whatever filtering scheme you might like).
Dimensions are always entirely processed (compiled) regardless of what data is presented to them, so there isn't any advantage to timestamping the records in the dimension table and filtering on them. What is important to understand is that any change to a hierarchy (adding members, deleting members, changing parentage) will trigger re-aggregation of the cube. If you can batch those changes periodically you can limit how much of the cube is processed during a refresh.
Continuing with the example of the daily update of the sales cube, we can examine two scenarios. In both cases, the cube is partitioned by month and a fact view filters for only the new or updated fact records (let's say there are new records every day).
Scenario 1
New records are added to the sales fact table and new stores are added to the store dimension table each day. The store dimension will be updated with new stores, new records will be loaded from the fact table and all partitions will be processed (loaded and solved/aggregated).
Scenario 2
New records are added to the fact table, but new stores loaded into the store dimension only once a week (e.g., Saturday). The fact view filters for only new or changed records and stores that currently exist in the store dimension. For Sunday through Friday, new or changed records will be loaded from the fact table and only those partitions in the cube that have new or updated data will be solved / aggregated. (If there are no changes to hierarchies and no records are loaded into a partition, that partition is not solved / aggregated). On Saturday, new stores are added to the store dimension table and the store dimension and the cube are updated. Because the store dimension has changed, all partitions of the will be processed.
With scenario 1, data for new stores are available each day but the entire cube might be solved each day (if there are new stores). In scenario two, new stores are not available until Saturday but the processing of the cube will be limited to only those partitions where there is new fact data.

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Will MV cause locking for FAST REFRESH

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